Ferric chloride solution constantly scouring the surface of stainless steel plate, the solution of ferric ion rapidly oxidized stainless steel plate, stainless steel plate was etched on the go.
三氯化铁溶液不断地冲刷不锈钢板的表面，溶液中的三价铁离子快速氧化不锈钢板，不锈钢板就被蚀刻下去了。
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Neil Comins (Astronomer): They probably would have covered hundreds of miles and then they would come back 13)scouring the land, taking debris from the surface of the Earth into the oceans.